Abstract: Lu Cun mine auxiliary shaft in the construction depth of 22.7 ~ 25m, in the construction of drilling hole, obviously feel a top drill phenomenon, pulling from the borehole spurt water column height 1200mm, after blasting water reached 210m3/h. In order to solve the above problem, reduce 40m level required for the calculation of water discharge is 621.05 m3/h. According to the results of the design layout of the 9 construction well by pumping. The results show that the number of precipitation well construction in the design of appropriate, precipitation effect.

Key words: Reduce the water level method, The strong aquifer, Luohe group, Lu Cun the first mine subsidiary